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Schedule of Participating Mortgage Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Total $ 639,875 $ 509,101
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Total $ 28,157 $ 40,462